Solution for SO 11577363 - How do I customise the resource key lookup for spring MVC validation messages

PostfixMessageCodeResolver.java

package com.yourapplication.web.support;

import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.validation.DefaultMessageCodesResolver;

import java.util.ArrayList;
import java.util.List;


/**
 * This reverses the DefaultMessageCodesResolver convention.
 *
 * object.field.errorCode
 * field.errorCode
 * type.errorCode
 * errorCode
 */
@Component
public class PostfixMessageCodesResolver extends DefaultMessageCodesResolver {

    /**
     * Build the code list for the given code and field: an
     * object/field-specific code, a field-specific code, a plain error code.
     * @return the list of codes
     */
    @Override
    public String[] resolveMessageCodes(String errorCode, String objectName, String field, Class<?> fieldType) {
        List<String> codeList = new ArrayList<String>();
        List<String> fieldList = new ArrayList<String>();
        buildFieldList(field, fieldList);
        for (String fieldInList : fieldList) {
            codeList.add(postProcessMessageCode( objectName + CODE_SEPARATOR + fieldInList + CODE_SEPARATOR + errorCode ));
        }
        int dotIndex = field.lastIndexOf('.');
        if (dotIndex != -1) {
            buildFieldList(field.substring(dotIndex + 1), fieldList);
        }
        for (String fieldInList : fieldList) {
            codeList.add(postProcessMessageCode(fieldInList + CODE_SEPARATOR + errorCode ));
        }
        if (fieldType != null) {
            codeList.add(postProcessMessageCode(fieldType.getName()  + CODE_SEPARATOR + errorCode));
        }
        codeList.add(postProcessMessageCode(errorCode));
        return StringUtils.toStringArray(codeList);
    }

    @Override
    public String[] resolveMessageCodes(String errorCode, String objectName) {
        return new String[] {
            postProcessMessageCode( objectName + CODE_SEPARATOR + errorCode ),
            postProcessMessageCode(errorCode)};
    }

}

WebConfiguration.java

package com.persephone.web;

import com.yourapplication.web.support.PostfixMessageCodesResolver;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

import javax.annotation.PostConstruct;

/**
 *
 */
@Configuration
@EnableWebMvc
public class WebConfiguration extends WebMvcConfigurerAdapter {
    // this isn't complete...only shows the hook for the messageCodes resolver

    @Autowired
    private RequestMappingHandlerAdapter requestMappingHandlerAdapter;

    @PostConstruct
    public void init() {
        ConfigurableWebBindingInitializer bindingInitializer = (ConfigurableWebBindingInitializer) requestMappingHandlerAdapter.getWebBindingInitializer();

        bindingInitializer.setMessageCodesResolver(new PostfixMessageCodesResolver());
    }

}

Created as a solution to my own question on stackoverflow.com

http://stackoverflow.com/questions/11577363/how-do-i-customise-the-resource-key-lookup-for-spring-mvc-validation-messages